6921255592891 has 2 divisors, whose sum is σ = 6921255592892. Its totient is φ = 6921255592890.

The previous prime is 6921255592879. The next prime is 6921255592903. The reversal of 6921255592891 is 1982955521296.

It is a balanced prime because it is at equal distance from previous prime (6921255592879) and next prime (6921255592903).

It is a cyclic number.

It is not a de Polignac number, because 6921255592891 - 2¹⁷ = 6921255461819 is a prime.

It is not a weakly prime, because it can be changed into another prime (6921255592871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460627796445 + 3460627796446.

It is an arithmetic number, because the mean of its divisors is an integer number (3460627796446).

Almost surely, 2^{6921255592891} is an apocalyptic number.

6921255592891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6921255592891 is an equidigital number, since it uses as much as digits as its factorization.

6921255592891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992000, while the sum is 64.

The spelling of 6921255592891 in words is "six trillion, nine hundred twenty-one billion, two hundred fifty-five million, five hundred ninety-two thousand, eight hundred ninety-one".